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  #25  
Old 12-12-2013, 09:56 AM
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does overinflation cause extra wear on suspension and steering components?

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  #26  
Old 12-12-2013, 10:02 AM
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Re: Recommended Tire Pressures

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Originally Posted by jacko15 View Post
I've been reading this thread, and just wondering, does anyone actually inflate their tires to the manufacturer's recommended psi? Is that a number they pull out of a hat, or is it actually something that has been tested and found to be good?
I do sometimes. But, during the summer I have to air up coming off the beach. The tires aren't cold, or hot, so I normally go to 35.

Any time I've been to the dealer, the evic shows 33 when I leave. I don't change it. IIRC the dealer I bought it from delivered it with pressures ranging from 31 to 42 or something like that.

When I got home I downloaded the owner's manual to see if that was correct, my first GC so I wasn't sure.


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  #27  
Old 12-12-2013, 10:06 AM
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Re: Recommended Tire Pressures

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Originally Posted by zeprider25 View Post
does overinflation cause extra wear on suspension and steering components?

possibly but more likely is since the sidewall doesnt flex as much you could bend a wheel or bend a suspension or steering component when you hit a pothole.
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  #28  
Old 12-12-2013, 01:23 PM
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Quote:
Originally Posted by jacko15 View Post
I've been reading this thread, and just wondering, does anyone actually inflate their tires to the manufacturer's recommended psi? Is that a number they pull out of a hat, or is it actually something that has been tested and found to be good?
The tires on my ram 1500 say 80 so thats what they get set to. My contact patch might only be 2 inches wide but I get better mileage thag way sp I think it is a fair trade.
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  #29  
Old 12-12-2013, 02:04 PM
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Re: Recommended Tire Pressures

Quote:
Originally Posted by bill_de View Post
It's the same book that dictates you should change your oil every 1,000 miles or 10,000 miles. And in both cases the answer is probably somewhere in the middle.

Higher air pressure will tend to wear tire centers. Low pressure will wear the edges. Tire companies have tested and proved this over time.

But, the exact 'proper' pressure is a little fuzzy. The tire has the 'maximum' pressure stamped on it. While this might be a conservative #, I would pay some attention to it. The auto maker gives a 'recommended' pressure. The auto maker needs to maximize mileage and handling while still keeping an eye on smooth ride.

When radials first became popular, many luxury manufactures were recommending 23 PSI. That gave radials a reputation for blowing out. But that Coupe de Ville was smooooth!

There is no perfect PSI, just don't ignore the guide lines.
The max inflation is usually for adding air to deal with heavy loads... and strongly suspect the engineers shave off a bit for safety.

Radials and bias used to wear differently due to under/overinflation. I don't recall anyone recommending 23 psi on luxury cars, but I started running radials in the 50s when the old Michelin/Pirelli and later Dunlops would always get "hey buddy, your tires are flat" due to that pronounced bulge of the older ones at the treadline.

The pressures certainly seem biased to ride comfort... I can't recall how long its been that I stayed at them as opposed to running about 4-6 over and damn the wear pattern as I prefer the tighter handling feel. I'll take 70K instead of 75K just to enjoy that 70K a bit more.
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  #30  
Old 12-12-2013, 02:07 PM
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Re: Recommended Tire Pressures

Quote:
Originally Posted by Jim_in_PA View Post
mswlogo, I could be wrong, but I think that 36 is also designated for the 20s...which I run at 38 cold normally as previously mentioned. With the low 20º F out there this morning, I suspect they are sitting there at about 33 psi, down from 35 psi yesterday afternoon when I looked, however... The air is shrinking to try and stay warm.
Don't mind the shrinking. My office is in Broomfield CO where the air rushes around madly trying to warm up--and the local wind gauges are made from cinder blocks on a tripod [true story]
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  #31  
Old 12-12-2013, 02:08 PM
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Re: Recommended Tire Pressures

Quote:
Originally Posted by jacko15 View Post
I've been reading this thread, and just wondering, does anyone actually inflate their tires to the manufacturer's recommended psi? Is that a number they pull out of a hat, or is it actually something that has been tested and found to be good?
Lets just say I'm pretty sure that they don't pull it out of their hat--wrong end of the body.
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  #32  
Old 12-12-2013, 02:10 PM
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Re: Recommended Tire Pressures

Quote:
Originally Posted by zeprider25 View Post
does overinflation cause extra wear on suspension and steering components?
Not nearly as much as fitting ultralow profile tires does.
Or worse, wheels that move the wheel center too far in either directly.
...where the vehicle may or may not have enough design margin to make no difference.

If a few pounds over hurts the suspension, the vehicle is a piece of crap.
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  #33  
Old 12-12-2013, 08:38 PM
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Re: Recommended Tire Pressures

Quote:
Originally Posted by lstowell View Post
Don't mind the shrinking. My office is in Broomfield CO where the air rushes around madly trying to warm up--and the local wind gauges are made from cinder blocks on a tripod [true story]
Yea, I understand...my employer has a facility in Westminster and I've been in your "neighborhood" during colder times of the year from time to time..wind is nasty cold when it gets going!
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  #34  
Old 12-12-2013, 10:41 PM
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Re: Recommended Tire Pressures

I've been running 39 psi (all around) on my '14 Summit and have only been getting about 16-17mpg, but I have a heavy foot and only 400 miles on the odo...
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  #35  
Old 12-13-2013, 03:37 AM
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Could always apply the 4psi rule (search on google) to set tyre pressure.
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